Sheet-metal-elbow-forming machine



A. DIECKMANN.

SHEET METAL ELBOW FORMING MACHINE.

APPLICATION FILED JUNE 2,1915- Patented Jan. 6; 1920.

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A. DIECKMANN.

SHEET METAL ELBOW FORMING MACHINE.

APPLICATION FILED JUNE 2, I915.

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SHEET METAL ELBOW FORMING MACHINE.

APPLICATION FILED JUNE 2, 1915.

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Patented J an.

ADOLF DIECKMAINN,

PATENT orrioa OF CINCINNATI,

OHIO.

SI-IEET-1VIETA.L-ELBOW'-FORMING MACHINE.

Application filed June 2,

To all whom it may concern Be it known that I, ADoLr DIECKMANN, acitizen of the United States, residing at Cin cinnati, in the county ofHamilton and State of Ohio, have invented certain new and usefulImprovements in Sheet- Metal Elbow- Forming Machines, of which thefollowing is a specification.

My invention relates to improved mechanism to produce sheet metal elbowsof various types or patterns. One of its objects is to provide improvedmechanism to first corrugate or shape the elbow as to its crosssectional pattern and then to crimp or fold it to produce the elbowcurve. Another object is to provide improved mechanism to carry outthese operations conjointly and in harmony and expeditiously and with aminimum injury and strain upon the sheet metal of the elbow. Myinvention also comprises certain details of form, combination andarrangement all of which will be fully set forth in the description ofthe accompanying drawings in which:

Figure 1 is a view partly in section with portions broken away, sectionbeing on line 2 z of Fig. 6.

Fig. 2 is a diagram illustrating the cross sectional pattern of one typeof elbow to be produced.

Fig. 3 is a similar diagram illustrating another type of elbow.

Fig. 4: is a vertical section on line 00 m of Fig. 1.

Fig. 5 is a detail of the elbow feeding mechanism detached.

Fig. 6 is a front end elevation of Fig. 1. Fig. 7 is a diagramillustrating a modification of Fig. 6.

Fig. 8 is a similar diagram illustrating another modification.

The accompanying drawings illustrate the preferred embodiments of myinvention, in which A represents the frame of the machine on which ismounted a mandrel B. The sheet metal D from which the elbow is to beformed in the shape of a cylinder or tube preferably having an open seamat one side is slipped from the forward end over the mandrel until itengages or abuts at one end against a feeding sleeve which is fed stepby step forward upon the mandrel. A locked seam may be employed in theelbow blank. As illustrated the feeding sleeve comprises a split sleeveor collar 2 which has a recess 8 to receive the end of the tubeSpecification of Letters Patent.

Patented Jan. 6, 1920.

1915. Serial No. 31,769.

D and a tapered shank 4 to seat in a tapered recess in the collar 5. Thecollar 5 has two rearwardly projecting arms 6 which pass through guidesat the rear of the frame A on opposite sides of the mandrel and haveteeth 7 upon one face to be engaged by the feeding pawls 8 and also bythe locking pawls 9 which locking pawls are pivoted stationarilyrelative to frame A. The feeding pawls 8 are pivoted to the arms 10 of areciprocating bar 11 which is reciprocated by means of a cam roller 12engaging a cam groove in cam 14 carried by the main driving shaft E. Thecollar 5 also carries an arm F having a cam face F which engages rollers15 connected to a clutch lever 16 which moves a clutch member 17 on themain shaft E to clutch and unclutch the cam 18 thereto.

A stationary ring H carried by or formed integral with the frame Aserves as a sup port or bearing for a ring 19 which carries a series ofrollers 20 and is movable backward and forward through a partialrevolutionby means of a crank pin 24 a bar 21, cam rollers 22 and a cam25 on the shaft E. A series of jaws K are pivotally attached at 26 tothe ring H and their free tapered ends 27 are engaged by rollers 20 asthe ring 19 moves in one direction to force said jaws toward the mandrelso as to clamp the tube D between said jaws and the mandrel, and also tocause the tube to assume the corrugated or other cross sectional patternof the elite rior of the mandrel. As the ring 19 moves in the oppositedirection the jaws K are released a-nd retracted by engagement of thestuds 28 carried by the ring 19 with inclined faces 29 of the jaws,thereby enabling the tube to be fed forward before the jaws K againengage and clamp the tube to the mandrel. The jaws K may be retracted bysprings if desired.

In front of the ring H are a series of crimp forming blades 30 which aresupported relative to the frame A either pivotally or by means ofsliding engagement, clepending upon the pattern of elbow to be formed.The edges of these blades are practically the counterpart of the crosssectional pattern of the tube, and said blades are moved to and from thetube to produce an indentation 31 annularly, and eccentric to, andnearly encircling the tube by forcing the metal inwardly over the edgesof said blades. These indentations are deepest in the throat of theelbow or inside of the curve, and serve to take up the surplus metal informing the curve.

As illustrated in Fig. 6 the two upper blades are pivoted at 32 to aplate 32 attached to ring H" while the two lower blades slide in guides,.33. carried by the upper blades. The lower blades are pivoted at 34 toangle levers 35 which are pivoted at 36 to ring H and their free endsare connected by links 37 to a sliding spring retracted plate 38 mountedon frame A and reciprocated by cam 18 on shaft E. Links 39 also connectthe upper blades 30 to the levers 35. Movement of plate 38 downwardlyswings the upper blades inwardly and moves the lower blades bothinwardly and upwardly, to approximately the position indicated in dottedline Figs. 7 and 8.

Asillustrated in Figs. 7 and 8 four blades 30 are mounted in guides onthe frame A toslide substantially radially to and from the tube, beingactuated by means of suitable cam actuated levers, not shown, and whichwould vary according to the elbow pattern employed.

Mounted within the mandrel B is a plunger L which has a limited movementendwise relative to the mandrel. The plunger L is connected by a rod 40having an enlarged head and a cross-pin 42 with an inclined slot in abar l-t which travels in guides 455' on frame A and is actuated by a cam46 on shaft. E. The forward end of the plunger when in its forwardposition is slightly inside the blades 30, Plunger L also carries anauxiliary plunger L which is connected thereto by a ball and socketjoint 47 which permits a limited movement of plunger 11 relative toplunger L. TheplungerL in its forward position is outside of the blades30 so that the crimp 31 is formed between the crimping blades 30. Aftereach crimp 31.

is formed the head or plunger is retracted and the auxiliary plunger Llays the inwardly projecting crimp over flat upon the inner face of thetube or elbow by being drawn through or over the crimp. The tube is thenfed forward and also the plungers ready to form another crimp. Theclutch 17 is again dlsconnected for the last two or three forward stepsof the elbow feed.

As i lu rate q n Figl, he. cam f c s. of

tion without departing from the principle of my invention. 1

Having described my invention what I claim is:

1. A sheet metal elbow forming machine comprising a mandrel having onits eX- terior a non-cylindrical pattern, a frame encircling the freeend of said mandrel, an exteriorly supported and inwardly movable crimpformer located close to the free end of said mandrel, a series ofsegmental jaws the counterpart of the pattern of said mandrel mountedupon said frame and movable to and from said mandrel to shape and clampan elbow blank upon said mandrel during the formation of a crimp, a mainplunger having its exteriorof the same pattern as that of the mandrel,located inside of the elbow blank and between the crimp former and thefree end of the mandrel and movable endwise to and from the free end ofthe mandrel, and an auxiliary plunger of the pattern of the mandreljointedl-y connected to said main plunger and movable therewith to aposition outside of said crimp former.

2. A sheet metal elbow forming machine comprising a mandrel a frameencircling the free end of said mandrel, an eXteriorly supported andinwardly movable crimp former located close to the free end of saidmandrel. a series of segmental jaws pivotally mounted upon saidencircling frame with their free ends movable to and from said mandrelto clamp an elbow blank upon said mandrel during the formation of acrimp, an annu lar shaped member rotatably mounted upon said encirclingframe and provided with members to engage cam faces on said jaws to movesaid jaws to and from said mandrel, a main plunger located between saidcrimp former and the free end of said mandrel and movable endwise to andfrom said mandrel, and an auxiliary plun er jointedly con nected to andmovable with said main plunger and located outside of said crimp former.

3. A machine for forming sheet metal elbows comprising a mandrel tosupport the elbow blank, clamping jaws overhanging the end of saidmandrel to clamp the elbow blank to the mandrel, mechanism tosuccessively form inwardly projecting eccentric crimps in h lb w bla kouts de of said jaws, and a plunger reciprocating endwise within theelbow blank and movable into the overhanging portion of the clampingjaws.

4. A machine for forming sheet metal elbows comprising a supportingmandrel having a cylindrical section and a noncylindrical section,clamping jaws opposite said non-cylindrical mandrel section andoverhanging the end of said mandrel to form longitudinal corrugations inthe cylindrical elbow blank, means at the overhanging end of said jawsoperating from the exterior to successively press inwardly, projectingeccentric crimps at intervals in the elbow blank, and a plungerreciprocating endwise within the elbow blank and movable into'theoverhanging portion of the clamping aws.

5. A sheet metal elbow forming machine comprising a base, a hollowstationary mandrel carried thereby and having at its exterior anon-cylindrical pattern desired in the elbow, means to feed an elbowblank longitudinally of said mandrel step by step, a series of segmentaljaws assembled about the free end of said mandrel to compress the elbowblank to the exterior pattern of said mandrel, an annular shaped framecar ried by said base and encircling the free end of said mandrel uponwhich said jaws are pivotally mounted, means carried by said loop shapedframe to periodically open and close said jaws, a plurality of crimpforming blades located forward of the free end of the mandrel andmovable periodically toward and from the elbow blank to form inwardlyprojecting eccentric orimps in theelbow blank, a main plunger guided byand movable within said hollow mandrel and of an external pattern tocorrespond with the external pattern of the mandrel, an auxiliaryplunger having an external pattern to correspond with that of the mainplunger and jointedly connected with said main plunger, means toperiodically reciprocate said plungers endwise relative to said mandrel,and a main driving shaft to actuate said movable members in synchronism.

6. A sheet metal elbow forming machine comprising a base, a'hollowmandrel mountedupon said base and having exteriorly a rear cylmdrlcalportion and a forward non-cylindrical portion of the pattern desired inthe elbow, means to feed an elbow blank longitudinally of said mandrelstep by step, a series of segmental aws assembled about the free end ofsaid mandrel to compress the elbow blank to the external pattern of saidmandrel means to periodically open and close said jaws, a plurality ofcrimp forming blades located forward of the free end of the mandrel andmovable periodically toward and from the elbow blank to form inwardlyprojecting eccentric crimps in the elbow blank, a main plunger guided byand movable relative to said hollow mandrel and of an external patternto correspond with the external pattern of the free end of the mandrel,an auxiliary plunger of like pattern jointedly connected to said mainplunger and movable therewith, means to periodically reciprocate saidplungers endwise relative to said mandrel, and a main driving shaft toactuate said movable members in synchronism.'

7. A sheet metal elbow forming machine comprising a mandrel having atits exterior a non-cylindrical pattern desired in the elbow, a series ofsegmental jaws arranged. about the free end of said mandrel to compressthe elbow blank to the external pattern of said mandrel, means toperiodically open and close said jaws, a plurality of crimp formingblades located forward of the free end of the mandrel and movableperiodically toward and from the elbow blank to form inwardly projectingeccentric crimps in the elbow blank, a main plunger guided by andmovable relative to said mandrel having at its exterior a patternsimilar to that of said mandrel, an auxiliary plunger exteriorly of thepattern of the mandrel and jointedly connected to and movable with saidmain plunger, means to periodically reciprocate said plungers, endwiserelative to said mandrel, and a main driving shaft to actuate saidmovable mem bers in synchronism.

In testimony whereof I have aflixed my signature in presence to twowitnesses.

AD OLF DIE CKMANN Witnesses:

C. W. MILES, W. THORNTON Boennr.

